发表于:2007-11-02 14:50:00
楼主
- Physical connection
· RS422 Serial link with UTP cable and following RJ11 pin
assignments:
· Pin1 -not connected spacing
· Pin2 – Signal: More positive when marking/less positive when
· Pin3 – Signal: Less positive when marking/More positive when
spacing
· Pin4 – not connected
- Data format
· 9600 baud
· One START bit
· 7 ASCII data bits
· 1 Even parity bit
· 1 stop bit
· All messages start with STX and end with ETX, CR, LF